Finned tube heat exchanger

Abstract

A finned tube heat exchanger is disclosed in which the structure thereof is simple, and the heat exchanging performance is increased. The heat exchanger has a plurality of fin plates arranged in parallel with one another, and a plurality of heat exchanger tubes extending through the fin plates. Each of the fin plates has a plurality of projected strips, and the strips include first to ninth rows of strips disposed in a parallel relationship. Each of the first and ninth rows of strips is formed of a trapezoidal strip and two parallelogrammic strips, each of the second to eighth rows of strips is a strip extending between openings disposed adjacent to one another in the longitudinal direction of the fin plate. The second to eighth rows of strips are disposed not to be spaced, and two sides of each of the second to eighth rows of strips provided with leg portions are curved to have the same curvature as that of the openings adjacent to the two sides.

What is claimed is: 
     
       1. A heat exchanger comprising: a plurality of fin plates spaced at regular intervals, arranged in parallel with one another and adapted to allow air to flow therebetween, each fin plate having openings arranged in a longitudinal direction thereof and a leading edge arranged perpendicularly to air flow; and   a plurality of heat exchanger tubes extending through said openings of said fin plates in a direction perpendicular to the planes in which said fin plates lie and being adapted to allow a refrigerant fluid to pass therein,   each of said fin plates having a plurality of strips projected from the surface of said fin plates and extending perpendicularly to a direction in which air is to flow between said fin plates,   said strips being composed of first to ninth rows of strips arranged between said openings, which are disposed adjacent to one another, along the longitudinal direction of said fin plates in a parallel relationship,   said first row of strips being located near the leading edge of said fin plates and consisting of a trapezoidal strip having a long side located on the upper stream of the air flow and two parallelogrammic strips located on both sides of said trapezoidal strip in the longitudinal direction, each of said second to eighth rows of strips consisting of a strip extending between said openings disposed adjacent to one another in the longitudinal direction, said ninth row of strips consisting of a trapezoidal strip having a long side located on the lower stream of the air flow and two parallelogrammic strips located on both sides of said trapezoidal strip in the longitudinal direction,   two opposing sides of each of said first to ninth rows of strips, facing the air flow, being opened by cutting and the other two sides thereof being provided with leg portions for connecting said first to ninth rows of strips with said fin plates,   wherein said first, second, fourth, sixth, eighth and ninth rows of strips are formed on the same side of said fin plates, while said third, fifth and seventh rows of strips are formed on the other side thereof.   
     
     
       2. The heat exchanger as claimed in claim 1, wherein said first and ninth rows of strips have a projecting height of about 1.0 mm. 
     
     
       3. The heat exchanger as claimed in claim 1, wherein said second to eighth rows of strips have a projecting height of about 0.6 mm. 
     
     
       4. The heat exchanger as claimed in claim 1, wherein said first to ninth rows of strips have a width of about 0.96 mm. 
     
     
       5. The heat exchanger as claimed in claim 1, wherein said first to fourth rows of strips are disposed in a symmetric relationship with said sixth to ninth rows of strips with respect to said fifth row of strips. 
     
     
       6. The heat exchanger as claimed in claim 1, wherein said second row of strips is disposed to be spaced from said first row of strips at an interval and said ninth row of strips is disposed to be spaced from said eighth row of strips at an interval, while said second to eighth rows of strips are disposed not to be spaced. 
     
     
       7. The heat exchanger as claimed in claim 1, wherein two sides of each of said second to eighth rows of strips provided with said leg portions are curved to have the same curvature as that of openings adjacent to the two sides. 
     
     
       8. A heat exchanger comprising: a plurality of fin plates spaced at regular intervals, arranged in parallel with one another and adapted to allow air to flow therebetween, each fin plate having openings arranged in a longitudinal direction thereof and a leading edge arranged perpendicularly to air flow; and   a plurality of heat exchanger tubes extending through said openings of said fin plates in a direction perpendicular to the planes in which said fin plates lie and being adapted to allow a refrigerant fluid to pass therein,   each of said fin plates having a plurality of strips projected from the surface of said fin plates and extending perpendicularly to a direction in which air is to flow between said fin plates,   said strips being composed of first to ninth rows of strips arranged between said openings, which are disposed adjacent to one another, along the longitudinal direction of said fin plates in a parallel relationship,   said first row of strips being located near the leading edge of said fin plates and consisting of a trapezoidal strip having a long side located on the upper stream of the air flow and two parallelogrammic strips located on both sides of said trapezoidal strip in the longitudinal direction, each of said second to eighth rows of strips consisting of a strip extending between said openings disposed adjacent to one another in the longitudinal direction, said ninth row of strips consisting of a trapezoidal strip having a long side located on the lower stream of the air flow and two parallelogrammic strips located on both sides of said trapezoidal strip in the longitudinal direction,   two opposing sides of each of said first to ninth rows of strips, facing the air flow, being opened by cutting and the other two sides thereof being provided with leg portions for connecting said first to ninth rows of strips with said fin plates,   said first and ninth rows of strips having a projecting height of about 1.0 mm, said second to eighth rows of strips having a projecting height of about 0.6 mm,   said first to ninth rows of strips having a width of about 0.96 mm,   said first, second, fourth, sixth, eighth and ninth rows of strips being formed on the same side of said fin plates, said third, fifth and seventh rows of strips being formed on the other side thereof,   said first to fourth rows of strips being disposed in a symmetric relationship with said sixth to ninth rows of strips with respect to said fifth row of strips,   said second row of strips being disposed to be spaced from said first row of strips at an interval, said ninth row of strips being disposed to be spaced from said eighth row of strips at an interval, said second to eighth rows of strips being disposed not to be spaced,   two sides of each of said second to eighth rows of strips provided with said leg portions being curved to have the same curvature as that of openings adjacent to the two sides.